KR20020051845A - Light permeable fluorescent cover for light emitting diode - Google Patents
Light permeable fluorescent cover for light emitting diode Download PDFInfo
- Publication number
- KR20020051845A KR20020051845A KR1020010081578A KR20010081578A KR20020051845A KR 20020051845 A KR20020051845 A KR 20020051845A KR 1020010081578 A KR1020010081578 A KR 1020010081578A KR 20010081578 A KR20010081578 A KR 20010081578A KR 20020051845 A KR20020051845 A KR 20020051845A
- Authority
- KR
- South Korea
- Prior art keywords
- light
- light emitting
- fluorescent cover
- emitting diode
- phosphor
- Prior art date
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- 239000011572 manganese Substances 0.000 claims abstract description 57
- -1 lanthanoid aluminates Chemical class 0.000 claims abstract description 9
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- 230000005284 excitation Effects 0.000 claims abstract description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 65
- 229920005989 resin Polymers 0.000 claims description 35
- 239000011347 resin Substances 0.000 claims description 35
- 239000000758 substrate Substances 0.000 claims description 11
- 229910052684 Cerium Inorganic materials 0.000 claims description 8
- 229910021193 La 2 O 3 Inorganic materials 0.000 claims description 6
- 229910052746 lanthanum Inorganic materials 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 5
- 239000003822 epoxy resin Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 229920000647 polyepoxide Polymers 0.000 claims description 5
- 229910017414 LaAl Inorganic materials 0.000 claims description 4
- 229920002050 silicone resin Polymers 0.000 claims description 4
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 238000007598 dipping method Methods 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 239000009719 polyimide resin Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000004925 Acrylic resin Substances 0.000 claims description 2
- 229920000178 Acrylic resin Polymers 0.000 claims description 2
- 229910020068 MgAl Inorganic materials 0.000 claims description 2
- 239000004677 Nylon Substances 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 239000004809 Teflon Substances 0.000 claims description 2
- 229920006362 Teflon® Polymers 0.000 claims description 2
- 238000009826 distribution Methods 0.000 claims description 2
- 229920001778 nylon Polymers 0.000 claims description 2
- 229920006122 polyamide resin Polymers 0.000 claims description 2
- 229920005668 polycarbonate resin Polymers 0.000 claims description 2
- 239000004431 polycarbonate resin Substances 0.000 claims description 2
- 229920001225 polyester resin Polymers 0.000 claims description 2
- 239000004645 polyester resin Substances 0.000 claims description 2
- 229920013716 polyethylene resin Polymers 0.000 claims description 2
- 229920005672 polyolefin resin Polymers 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 229920005990 polystyrene resin Polymers 0.000 claims description 2
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims description 2
- 238000000295 emission spectrum Methods 0.000 abstract description 27
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 23
- 239000000463 material Substances 0.000 abstract description 18
- 229910052747 lanthanoid Inorganic materials 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 150000004645 aluminates Chemical class 0.000 description 26
- 238000005538 encapsulation Methods 0.000 description 23
- JNDMLEXHDPKVFC-UHFFFAOYSA-N aluminum;oxygen(2-);yttrium(3+) Chemical compound [O-2].[O-2].[O-2].[Al+3].[Y+3] JNDMLEXHDPKVFC-UHFFFAOYSA-N 0.000 description 21
- 229910019901 yttrium aluminum garnet Inorganic materials 0.000 description 21
- 239000004065 semiconductor Substances 0.000 description 17
- 239000003086 colorant Substances 0.000 description 11
- 239000004020 conductor Substances 0.000 description 11
- 230000000295 complement effect Effects 0.000 description 9
- 238000001228 spectrum Methods 0.000 description 8
- 229910002601 GaN Inorganic materials 0.000 description 6
- 235000019646 color tone Nutrition 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000000695 excitation spectrum Methods 0.000 description 4
- 238000005286 illumination Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000000411 transmission spectrum Methods 0.000 description 3
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 2
- 239000012190 activator Substances 0.000 description 2
- ZMIGMASIKSOYAM-UHFFFAOYSA-N cerium Chemical compound [Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce] ZMIGMASIKSOYAM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052733 gallium Inorganic materials 0.000 description 2
- 150000002602 lanthanoids Chemical class 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910052594 sapphire Inorganic materials 0.000 description 2
- 239000010980 sapphire Substances 0.000 description 2
- MCSXGCZMEPXKIW-UHFFFAOYSA-N 3-hydroxy-4-[(4-methyl-2-nitrophenyl)diazenyl]-N-(3-nitrophenyl)naphthalene-2-carboxamide Chemical group Cc1ccc(N=Nc2c(O)c(cc3ccccc23)C(=O)Nc2cccc(c2)[N+]([O-])=O)c(c1)[N+]([O-])=O MCSXGCZMEPXKIW-UHFFFAOYSA-N 0.000 description 1
- 229910052692 Dysprosium Inorganic materials 0.000 description 1
- 229910052689 Holmium Inorganic materials 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 241001327273 Parachela oxygastroides Species 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- 229910052773 Promethium Inorganic materials 0.000 description 1
- 229910052772 Samarium Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000007404 cerebral physiology Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005090 crystal field Methods 0.000 description 1
- 238000002109 crystal growth method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- KBQHZAAAGSGFKK-UHFFFAOYSA-N dysprosium atom Chemical compound [Dy] KBQHZAAAGSGFKK-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- KJZYNXUDTRRSPN-UHFFFAOYSA-N holmium atom Chemical compound [Ho] KJZYNXUDTRRSPN-UHFFFAOYSA-N 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910001437 manganese ion Inorganic materials 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 230000035479 physiological effects, processes and functions Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920001690 polydopamine Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 description 1
- VQMWBBYLQSCNPO-UHFFFAOYSA-N promethium atom Chemical compound [Pm] VQMWBBYLQSCNPO-UHFFFAOYSA-N 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
- H01L33/504—Elements with two or more wavelength conversion materials
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
- C09K11/7774—Aluminates
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7783—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals one of which being europium
- C09K11/7792—Aluminates
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/481—Disposition
- H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/48245—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic
- H01L2224/48247—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic connecting the wire to a bond pad of the item
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/505—Wavelength conversion elements characterised by the shape, e.g. plate or foil
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Led Device Packages (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Led Devices (AREA)
- Luminescent Compositions (AREA)
Abstract
Description
본 발명은 형광커버, 특히 발광다이오드에 피복되고 또한 발광다이오드로부터 조사되는 빛의 파장을 변환하여, 다른 파장의 빛을 외부에 방출하는 투광성 형광커버에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent cover, in particular a translucent fluorescent cover which emits light of different wavelengths to the outside by converting the wavelength of light that is coated on the light emitting diode and radiated from the light emitting diode.
도 9는 발광다이오드를 피복하고, 발광다이오드의 발하는 빛을 파장변환하며 또한 투광성을 갖는 종래의 형광피복재(투광성 형광커버)의 단면도를 나타낸다. 에폭시수지, 유리어수지 또는 실리콘으로부터 선택되는 광 투과성의 기재와, 기재중에 배합된 형광물질로 되는 투광성의 형광커버(6)는 형광물질의 분말을 겔형상의 실리콘수지원료에 혼합하고, 피복해야 할 발광다이오드의 외부형상에 상보적(相補的)형상을 갖는 금형내에 실리콘수지원료를 압입하여 가열성형된다. 형광커버(6)안에 혼입되는 형광물질은 유기형광안료등의 유기형광체 또는 무기형광체가 쓰이고, 형광커버(6)를 피착하는 발광다이오드는 형광물질을 효율적으로 여기(勵起)할 수 있는 질화 갈륨계의 청색발광다이오드가 쓰인다. 유기형광체는 청색발광다이오드의 빛에 의해서 단시간에 열화하기 때문에, 실제는 무기형광체, 특히 Ce(세륨)으로 부활(賦活)된 잇트륨·알미늄·석류석(YAG)계 형광체(이하, YAG:Ce계 형광체) (7)가 쓰인다.Fig. 9 shows a cross-sectional view of a conventional fluorescent coating (transparent fluorescent cover) which covers a light emitting diode, converts light emitted from the light emitting diode, and converts light into light. The light transmissive fluorescent cover 6 made of an epoxy resin, a glass fish resin, or a silicone and a fluorescent material blended in the substrate should be mixed with a gel-like silicone resin and coated with a powder of fluorescent material. The silicon support material is press-molded into a mold having a shape complementary to the external shape of the light emitting diode, and is heated and molded. The fluorescent material mixed in the fluorescent cover 6 is an organic fluorescent substance such as an organic fluorescent pigment or an inorganic fluorescent substance, and the light emitting diodes to which the fluorescent cover 6 is deposited are gallium nitride which can efficiently excite the fluorescent substance. Blue light emitting diodes are used. Since the organic phosphor deteriorates in a short time by the light of the blue light emitting diode, it is actually an yttrium aluminum garnet (YAG) phosphor (hereinafter referred to as YAG: Ce-based phosphor) which is activated by an inorganic phosphor, especially Ce (cerium). Phosphor) (7) is used.
도 10에 나타내는 종래의 발광장치는 통상 캐소드리드를 구성하는 제 1 배선도체(1)와, 통상 애노드리드를 구성하는 제 2 배선도체(2)와, 제 1 배선도체(l)의정점부에 형성된 오목부(1a)에 고착된 질화갈륨계 화합물반도체 등의 발광 반도체칩(3)과, 발광 반도체칩(3)의 도시하지 않은 전극과 제 2 배선도체(2)의 정점부를 전기적으로 접속하는 리드세선(4)과, 제 1 및 제 2 배선도체(1,2)의 상부, 발광반도체칩(3) 및 리드세선(4)을 피복하는 광투과성의 수지봉지체(5)를 대비하고 있다. 수지봉지체(5)는 아래쪽의 원주부(5a)와, 원주부(5a) 위에 반구형상으로 형성된 구면부(5b)를 구비하며, 수지봉지체(5)의 외측에 형광커버(6)가 피착된다. 형광커버 (6)는 수지봉지체(5)의 원주부(5a)와 상보적 형상의 공동부를 형성하는 원통부(6a)와, 원통부(6a) 상부에 형성되며 또한 수지봉지체(5)의 구면부(5b)와 상보적 형상의 공동부를 형성하는 구면부(6b)를 구비하고 있다. 형광커버(6)의 일끝단에 설치된 개구부(6c)를 통하여, 형광커버(6)를 수지봉지체에 장착하면, 형광커버(6)의 내면(6d)은 수지봉지체(5)의 외면에 밀착하기 때문에, 장착후에 진동 등의 외부힘이 투광성의 형광 커버(6)에 가해져도 형광커버(6)는 수지봉지체(5)에서 용이하게는 이탈하지 않는다.The conventional light emitting device shown in FIG. 10 is formed on the apex portions of the first wiring conductor 1 constituting the cathode, the second wiring conductor 2 constituting the anode, and the first wiring conductor 1. A lead for electrically connecting the light emitting semiconductor chip 3 such as a gallium nitride compound semiconductor fixed to the recess 1a, an electrode (not shown) of the light emitting semiconductor chip 3, and the vertex portion of the second wiring conductor 2. A light-transmissive resin encapsulation member 5 covering the thin wire 4 and the upper portions of the first and second wiring conductors 1 and 2, the light emitting semiconductor chip 3, and the lead thin wire 4 is prepared. The resin encapsulation 5 has a lower circumferential portion 5a and a spherical spherical portion 5b formed in a hemispherical shape on the circumferential portion 5a, and a fluorescent cover 6 is provided on the outer side of the resin encapsulation 5. Is deposited. The fluorescent cover 6 is formed on the cylindrical portion 6a which forms a cavity having a complementary shape with the circumferential portion 5a of the resin encapsulation 5, and is formed on the cylindrical portion 6a and is also formed of the resin encapsulation 5. Is provided with a spherical portion 5b and a spherical portion 6b which forms a cavity having a complementary shape. When the fluorescent cover 6 is mounted on the resin encapsulation through the opening 6c provided at one end of the fluorescent cover 6, the inner surface 6d of the fluorescent cover 6 is formed on the outer surface of the resin encapsulation 5. Because of the close contact, even if an external force such as vibration is applied to the translucent fluorescent cover 6 after mounting, the fluorescent cover 6 does not easily detach from the resin encapsulation 5.
도 11, 도 12 및 도 13은 종래의 투광성 형광커버에 사용하는 YAG:Ce계 형광체의 여기 스펙트럼, 그 발광 스펙트럼 및 종래의 투광성 형광커버를 청색발광다이오드에 피복한 종래의 발광장치의 발광 스펙트럼을 각각 나타낸다. 발광 반도체칩 (3)에서 조사된 청색광의 일부는 형광커버(6)의 기재를 통과하여 직접외부로 방출되지만, 청색광의 일부는 기재중에 담지된 형광체(7)를 여기하기 때문에, 여기된 형광체(7)에서 황색광이 발생한다. 발광 반도체칩(3)에서 조사된 청색광과 형광체 (7)에서 조사되는 황색광은 보색의 관계에 있기 때문에, 청색광과 황색광이 합성되어 백색계의 빛이 외부로 방출된다.11, 12 and 13 show an excitation spectrum of a YAG: Ce-based phosphor used in a conventional translucent fluorescent cover, a light emission spectrum thereof, and a light emission spectrum of a conventional light emitting device in which a conventional light transmitting fluorescent cover is covered with a blue light emitting diode. Represent each. Part of the blue light irradiated from the light emitting semiconductor chip 3 passes directly through the base of the fluorescent cover 6 and is directly emitted to the outside. However, part of the blue light excites the phosphor 7 carried in the base, so that the excited phosphor ( Yellow light is generated in 7). Since the blue light irradiated from the light emitting semiconductor chip 3 and the yellow light irradiated from the phosphor 7 have a complementary color relationship, the blue light and the yellow light are synthesized to emit white light.
백색계의 빛을 발하는 종래의 발광장치는 구래의 관구식 백색광원을 구성하는 백열전구, 열음극형광관 또는 냉음극형광관에 비해서, 기계적 충격에 강하고, 발열량이 적으며, 고전압인가가 불필요하고, 고주파 노이즈가 발생하지 않고, 수은을 사용하지 않고 환경에 온화한 등의 우수한 이점이 있다. 또한 투광성 형광커버와 청색발광다이오드를 조합한 간편한 구조를 위해, 염가로 양산성에도 우수하고, 차세대 고체화 백색광원으로서 기대되고 있다.Conventional light emitting devices that emit white light are more resistant to mechanical impact, generate less heat, and do not require high voltage than incandescent lamps, hot cathode fluorescent tubes, or cold cathode fluorescent tubes that make up conventional white light sources. There is an excellent advantage, such as no high-frequency noise, mild to the environment without using mercury. In addition, it is expected to be excellent in mass production at a low cost and to be a next-generation solidified white light source for a simple structure combining a translucent fluorescent cover and a blue light emitting diode.
그렇지만, 우수한 상기 이점을 가지는 종래의 발광장치에서도, 하기의 결점을 병유하기 때문에, 제조 및 응용에 여러가지 지장과 제약이 생긴다는 난점이 있다. 선명한 발광 스펙트럼이 요구되는 투과형 칼라액정표시장치 등의 표시장치의 백라이트 백색광원에 사용한 경우, 색순도가 나쁘고 선명한 색채를 표현할 수 없는 결점이 생기는 것이, 종래의 발광장치의 첫 번째 문제이다.However, even in the conventional light emitting device having the above-mentioned advantages, since the following drawbacks occur, there are difficulties in producing various problems and limitations in manufacturing and application. When used in a backlight white light source of a display device such as a transmissive color liquid crystal display device that requires a clear emission spectrum, it is a first problem of the conventional light emitting device that a color purity is poor and a defect cannot be expressed.
통상, 삼원색의 청·녹·적색의 발광 스펙트럼을 가지며 또한 서로 이격되어 배치된 삼파장냉음극형광관은 투과형 칼라액정표시장치의 백라이트로서 사용된다. 일예로서 도 14에 나타낸 바와 같이, 삼파장냉음극형광관은 청, 녹, 적색의 각각 선명한 피크를 가지는 발광 스펙트럼을 나타내며, 일예로서 도 15에 나타낸 바와 같이, 투과형 칼라액정표시장치의 삼원색 화소를 구성하는 청·녹·적색의 칼라 필터는 광범위한 투과 스펙트럼을 가진다. 투과형 칼라액정표시장치에서는, 삼원색의 청·녹·적색을 구성하는 각 화소의 투과광스펙트럼은 삼파장냉음극형광관의 발광 스펙트럼으로 사실상 결정되어, 칼라 필터는 한계를 특정할 수 없는 대략적인범위에서 빛을 여파(濾波)하여, 일화소의 투과광 스펙트럼(예컨대, 적색)으로의 다른 2원색성분(예컨대, 녹과 청)의 혼입을 방지하는 역할을 가지는 것에 불과하기 때문에, 칼라 필터의 투과특성만으로 색순도가 높은 색채를 표현하는 것은 곤란하다.Usually, three-wavelength cold cathode fluorescent tubes having three primary colors of blue, green, and red emission spectra and spaced apart from each other are used as backlights of transmissive color liquid crystal display devices. As an example, as shown in FIG. 14, the three-wavelength cold cathode fluorescent tube exhibits an emission spectrum having clear peaks of blue, green, and red, respectively. As an example, as shown in FIG. 15, the three primary color pixels of the transmissive color liquid crystal display are constituted. Blue, green and red color filters have a broad transmission spectrum. In the transmissive color liquid crystal display device, the transmission light spectrum of each pixel constituting the three primary colors of blue, green, and red is virtually determined by the emission spectrum of the three-wavelength cold cathode fluorescent tube, and the color filter emits light in an approximate range where the limit cannot be specified. This filter has only a role of preventing the incorporation of other two primary color components (eg, green and blue) into the transmitted light spectrum (eg, red) of a single pixel, and thus the color purity only by the transmission characteristics of the color filter. It is difficult to express high hues.
그렇지만, 도 12에 나타내는 종래의 발광장치에서는, YAG:Ce계 형광체(7)의 발광 스펙트럼의 파장 영역이 대단히 폭넓기 때문에, 발광장치의 광원은 도 13에 나타내는 발산적인 파장 영역의 발광 스펙트럼을 가진다. 따라서, 종래의 발광장치를 사용하는 투과형 칼라액정표시장치에서는, 칼라 필터의 투과 스펙트럼에서 각 화소의 투과광 스펙트럼을 결정하여야 하며, 색순도가 나쁘고 선명한 색채를 표현할 수 없는 종래의 발광장치는 투과형 칼라액정표시장치의 백라이트에는 알맞지 않다.However, in the conventional light emitting device shown in Fig. 12, since the wavelength range of the light emission spectrum of the YAG: Ce-based phosphor 7 is very wide, the light source of the light emitting device has the light emission spectrum of the divergent wavelength range shown in Fig.13. . Therefore, in the transmissive color liquid crystal display device using the conventional light emitting device, the transmitted light spectrum of each pixel must be determined from the transmissive spectrum of the color filter, and the conventional light emitting device in which the color purity is bad and cannot express vivid colors is the transmissive color liquid crystal display. Not suitable for the backlight of the device.
또한, 적색광 성분이 적은 종래의 발광장치에서는, 예컨대 반사형 칼라액정표시장치 등의 보조광원에 사용한 경우, 뛰어난 색조 밸런스로 표시할 수 없다는 두번째 문제가 있다. 최근의 정보통신기술의 진전에 따라, 휴대전화, PHS, PDA, 소형노트PC 등의 모바일기기에 반사형 칼라액정표시장치가 다용되고 있다. 투과형 칼라액정표시장치와 다르고, 통상은 표시장치표면에 조사된 태양광선 등의 외부광의 반사광을 이용하여 칼라표시를 하는 반사형 칼라액정표시장치에서는, 외부광이 없는 어두운 곳에서는 칼라표시가 불가능하기 때문에, 표시장치의 화면 안쪽면에 백색계의 빛을 발하는 보조광원(프론트라이트)을 설치하여 칼라표시에 대응하고 있다. 그렇지만, 도 12에 나타낸 바와 같이 YAG:Ce계 형광체(7)의 발광 스펙트럼의적색광성분이 원래 적은 종래의 발광장치를 반사형 칼라액정표시장치의 보조광원에 채용한 경우, 도 13에 나타낸 바와 같이 상대적으로 적색광성분이 적은 발광 스펙트럼을 가지는 광원으로 이루어진다.In addition, in the conventional light emitting device having less red light component, there is a second problem that it cannot be displayed with excellent color balance when used for an auxiliary light source such as a reflective color liquid crystal display device. Background Art With recent advances in information and communication technology, reflective color liquid crystal display devices are being used in mobile devices such as mobile phones, PHS, PDAs, and small notebook PCs. In contrast to the transmissive color liquid crystal display device, the color display is not possible in a dark place without external light in the color reflective liquid crystal display device in which color display is usually performed by using reflected light of external light such as solar rays irradiated onto the surface of the display device. Therefore, an auxiliary light source (front light) emitting white light is provided on the inner surface of the screen of the display device to cope with color display. However, as shown in FIG. 12, when the conventional light emitting device that originally had a small red light component of the emission spectrum of the YAG: Ce-based phosphor 7 was employed as an auxiliary light source of the reflective color liquid crystal display device, as shown in FIG. It consists of a light source which has the emission spectrum with relatively little red light component.
반사형 칼라액정표시장치의 색조밸런스는 일반적으로 주요한 외부광원인 태양광의 스펙트럼을 기준으로 하여 설계되고, 적색성분을 많이 포함하는 태양광선의 스펙트럼 하에서는 종래의 발광장치의 색조는 표시화상전체로 거의 균질상태가 된다. 그렇지만, 적색광 성분이 적은 종래의 발광장치를 반사형 칼라액정표시장치의 보조광원에 채용하여, 어두운 곳 등에 보조광원을 점등하면, 적색계 색채가 어둡게 표시되기 때문에, 외부광과 비교해서 표시화상전체의 색조가 언밸런스가 되는 문제가 생긴다.The color balance of the reflective color liquid crystal display device is generally designed based on the spectrum of sunlight, which is a major external light source, and under the spectrum of sunlight containing many red components, the color tone of a conventional light emitting device is almost homogeneous to the entire display image. It becomes a state. However, when a conventional light emitting device having a small red light component is employed as an auxiliary light source of the reflective color liquid crystal display device and the auxiliary light source is turned on in a dark place or the like, the red color is darkened, so that the entire display image is compared with the external light. The problem is that the color tone is unbalanced.
또한, 종래의 발광장치에 생기는 세 번째 문제는, YAG:Ce계 형광체(7)가 발하는 황색광이 청색발광소자의 발하는 청색광과 보색의 관계에 있기 때문에, 종래의 발광장치에서 조사되는 빛을 인간이 계속 보면 눈이 피로해진다는 점이다.In addition, a third problem occurring in the conventional light emitting device is that yellow light emitted by the YAG: Ce-based fluorescent material 7 has a complementary color relationship with blue light emitted by the blue light emitting device, and therefore, the light emitted from the conventional light emitting device may be human. This keeps the eyes tired.
예컨대 청색광과 황색광과 같이 서로 보색의 관계에 있는 빛을 동시에 계속 보면, 안정(眼精)피로가 촉진된다는 것이 대뇌생리학상의 연구로 알려지고 있다. 종래의 발광장치는 청색발광다이오드보다 생기는 청색광과 YAG:Ce계 형광체(7)에서 생기는 황색광의 혼색에 의해서 외부에 방출하는 빛을 만들어낸다. 따라서, 예컨대 종래의 발광장치를 일반의 조명광원으로서의 빛 아래에서, 장시간 눈을 사용하는 독서 등의 작업을 하면 눈이 피로해지는 것은 분명하다. 종래의 발광장치와 같이, 보색의 관계에 있는 2색의 혼색에 의해서 백색광을 만드는 방식을 사용하는 한본질적으로 이 문제를 회피할 수가 없다.For example, it is known that cerebral physiology studies show that, when the light in complementary colors such as blue light and yellow light continues to be viewed at the same time, stable fatigue is promoted. Conventional light emitting devices produce light emitted to the outside by a mixture of blue light generated from a blue light emitting diode and yellow light generated from the YAG: Ce-based phosphor 7. Therefore, it is obvious that, for example, when a conventional light emitting device is used under a light as a general illumination light source for a long time, such as reading using the eye, the eyes become tired. As in the conventional light emitting device, this problem cannot be avoided in essence, as long as a method of producing white light by mixing two colors in complementary colors is used.
또한, 종래의 발광장치에 생기는 네 번째 문제는 청색발광다이오드가 발하는 청색광과 YAG:Ce계 형광체(7)의 발하는 황색광으로 이루어지는 다른 파장광의 혼색에 의해서 방출광이 합성되기 때문에, 합성가능한 혼색광의 색도범위가 지극히 좁고, 여러가지 색조의 빛을 합성할 수 없다는 점이다.In addition, a fourth problem that occurs in the conventional light emitting device is that the emitted light is synthesized by the mixing of blue light emitted by the blue light emitting diode and other wavelength light composed of yellow light emitted by the YAG: Ce-based phosphor 7, and therefore, The chromaticity range is extremely narrow and it is impossible to synthesize light of various colors.
혼색광학이론에서는, 색도도상의 빛 a의 색도좌표를(xa, ya), 빛 b의 색도좌표를(xb, yb)로 하고, 다른 파장의 빛 a와 빛 b를 혼색시킨 경우, 빛 a와 빛 b의 혼색광의 색도좌표(xm, ym)은 (xa, ya)와 (xb, yb)의 2점을 맺은 직선상에 있고, 또한, 빛 a의 세기와 빛 b의 세기에 따라 결정되는 점에 위치하며, 빛 a가 강하면 (xa, ya)집합에, 빛 b가 강하면 (xb, yb)집합에 위치하는 것이 알려지고 있다.In the mixed-color optical theory, when the chromaticity coordinates of light a on the chromaticity diagram (xa, ya) and the chromaticity coordinates of light b are (xb, yb), and light a and light b of different wavelengths are mixed, The chromaticity coordinates (xm, ym) of the mixed light of light b are on a straight line forming two points of (xa, ya) and (xb, yb), and are also determined by the intensity of light a and the intensity of light b. It is known to be located in the (xa, ya) set if the light a is strong and in the (xb, yb) set if the light b is strong.
도 16은 종래의 발광장치에 얻어지는 혼색의 원리를 나타낸다. 청색발광다이오드의 발하는 청색광과 YAG:Ce계 형광체(7)의 발하는 황색광의 다른 파장의 빛의 혼색에 의해서 외부에 방출하는 빛을 합성하는 종래의 발광장치에서는, 상기 혼색광학이론을 직접 적용할 수 있다. 즉, 빛a를 청색발광다이오드의 발하는 청색광, 빛b를 YAG:Ce계 형광체(7)의 발하는 황색광으로 하면, 종래의 발광장치가 방출하는 빛은 청색발광다이오드의 발하는 청색광의 색도좌표와 YAG:Ce계 형광체(7)의 발하는 황색광의 색도좌표를 맺는 직선상에서만 존재할 수밖에 없고, 매우 한정된 색조의 빛밖에 만들어낼 수 없는 것이 실상이다.Fig. 16 shows the principle of mixed color obtained in a conventional light emitting device. In the conventional light emitting device which synthesizes blue light emitted from the light emitting diode and blue light emitted from the YAG: Ce-based phosphor 7 and mixed with light of different wavelengths of yellow light, the mixed optical theory can be directly applied. have. That is, if light a is blue light emitting blue light emitting diode and light b is yellow light emitting YAG: Ce-based phosphor 7, the light emitted by the conventional light emitting device is the chromaticity coordinate of the blue light emitting blue light emitting diode and YAG. The emission of the Ce-based phosphor 7 can exist only in a straight line that forms chromaticity coordinates of yellow light, and in reality, only light having a very limited color tone can be produced.
일반적으로 YAG:Ce계 형광체(7)의 모재인 YAG에 다른 원소를 첨가하여, 형광체(7)의 조성을 바꾸는 것에 의해 발광파장을 시프트하여, 상기 결점의 개선을 꾀하고 있다. 예컨대 갈륨(Ga)을 첨가하여 단파장측에 시프트하여, 가드륨(Gd)를 첨가하여 장파장측에 시프트하지만, 갈륨을 과도하게 고농도로 첨가하면, 발광효율이 저하하고, 가드륨을 지나치게 고농도로 첨가하면, 온도상승에 따라 발광효율이 저하하는 온도소광현상이 촉진된다. 어느 경우도 중요한 광학특성이 현저히 열화하기 때문에, 실용상 한정된 범위에서만 조성범위를 조정할 수 있다.In general, by adding another element to YAG, which is the base material of the YAG: Ce-based fluorescent substance 7, the emission wavelength is shifted by changing the composition of the fluorescent substance 7, thereby improving the above-mentioned shortcomings. For example, gallium (Ga) is added to shift to the short wavelength side, and gardium (Gd) is added to the shift to the long wavelength side. However, when gallium is added in excessively high concentration, the luminous efficiency is lowered, and gardium is added in too high concentration. When the temperature rises, the temperature quenching phenomenon in which the luminous efficiency is lowered is promoted. In any case, since the important optical characteristics deteriorate remarkably, the composition range can be adjusted only in a practically limited range.
종래의 발광장치의 발광가능한 색도범위를 도시한 도 17에서 분명하듯이, 종래의 발광장치의 발광가능한 색도범위는 청색발광다이오드의 발광의 색도좌표를 정점으로, 실용상 가능한 YAG:Ce계 형광체(7)의 색도좌표를 맺는 폭이 좁은 부채꼴형상의 내부에서 나타낸다. 이렇게, 종래의 발광장치는 비하여 YAG:Ce계 형광체(7)의 조성을 조정하더라도, 색도도 전체면적에 비해, 지극히 한정된 좁은 색도범위의 색조의 빛밖에 만들어낼 수 없고, 여러가지 색조의 빛을 필요로 하는 용도에는 사용할 수 없었다.As is apparent from FIG. 17 showing the light emission chromaticity range of the conventional light emitting device, the light emission chromaticity range of the conventional light emitting device is a peak of the chromaticity coordinates of the light emission of the blue light emitting diode, and a practical YAG: Ce-based phosphor ( It is represented inside the narrow fan shape that forms the chromaticity coordinates of 7). Thus, even when the composition of the YAG: Ce-based phosphor 7 is adjusted in comparison with the conventional light emitting device, the chromaticity can produce only the light of the hue of the extremely narrow narrow chromaticity range compared to the total area, and requires the light of various hue. It could not be used for the application.
구래의 관구식 광원에 비해서 여러가지 이점을 가지는 종래의 발광장치는 사용하는 YAG:Ce계 형광체(7)의 발광 스펙트럼으로부터 생기는 제약을 위해, 투과형 칼라액정표시장치 및 반사형액정표시장치, 일반조명광원 등 금후 큰 진전이 기대되는 분야의 광원에 적합하게 사용할 수 없는 중대한 문제가 있었다.Conventional light emitting devices having various advantages over conventional tube light sources are transmissive color liquid crystal display devices, reflective liquid crystal display devices, and general illumination light sources for the constraints arising from the emission spectrum of the YAG: Ce-based phosphor 7 used. There has been a serious problem that cannot be suitably used for light sources in fields where great progress is expected in the future.
본 발명은 선명한 발광 스펙트럼이 요구되는 투과형 칼라액정표시장치, 백라이트 등의 표시장치에 적합하게 적용할 수 있는 발광다이오드용 투광성 형광커버를 제공하는 것을 목적으로 한다. 아직, 본 발명은 뛰어난 색조 밸런스가 요구되는반사형 칼라액정표시장치 등의 보조광원에 적합하게 적용할 수 있는 발광다이오드용 투광성 형광커버를 제공하는 것을 목적으로 한다. 또한, 본 발명은 인간의 생리에 합치한 눈에 온화한 빛을 발하는 발광다이오드용 투광성 형광커버를 제공하는 것을 목적으로 한다. 또한, 본 발명은 넓은 색도범위의 색조를 갖는 빛을 발생할 수 있는 발광다이오드용 투광성 형광커버를 제공하는 것을 목적으로 한다. 또한, 본 발명은 염가로 품질이 뛰어난 발광다이오드용 투광성 형광커버를 제공하는 것을 목적으로 한다.An object of the present invention is to provide a light-emitting fluorescent cover for a light emitting diode that can be suitably applied to display devices such as a transmissive color liquid crystal display device and a backlight which require a clear emission spectrum. Yet, an object of the present invention is to provide a light emitting fluorescent cover for a light emitting diode that can be suitably applied to an auxiliary light source such as a reflective color liquid crystal display device requiring excellent color balance. In addition, an object of the present invention is to provide a light-transmitting fluorescent cover for a light emitting diode that emits a gentle light to the eye in conformity with human physiology. In addition, an object of the present invention is to provide a transparent fluorescent cover for a light emitting diode that can generate light having a color tone of a wide chromaticity range. In addition, an object of the present invention is to provide a light-transmitting fluorescent cover for a light emitting diode having excellent quality at low cost.
도 1은 본 발명에 의한 투광성 형광커버를 사용한 발광장치의 발광 스펙트럼을 나타내는 그래프,1 is a graph showing an emission spectrum of a light emitting device using a translucent fluorescent cover according to the present invention;
도 2는 La알루미네이트:Mn계 형광체의 여기 스펙트럼을 나타내는 그래프,2 is a graph showing excitation spectra of La aluminate: Mn-based phosphors;
도 3은 La알루미네이트:Mn계 형광체의 발광스펙트럼을 나타내는 그래프,3 is a graph showing emission spectra of La aluminate: Mn-based phosphors;
도 4는 Mn부활 La알루미네이트계 형광체의 Mn 첨가량과 발광색의 관계를 나타내는 그래프,4 is a graph showing the relationship between the amount of Mn added and the emission color of Mn-activated La aluminate-based phosphors;
도 5는 본 발명에 의한 투광성 형광커버를 사용한 발광장치의 혼색의 원리를 나타내는 그래프,5 is a graph showing the principle of color mixing of a light emitting device using a translucent fluorescent cover according to the present invention;
도 6은 본 발명에 의한 투광성 형광커버를 사용한 발광장치의 발광가능한 색도범위를 나타내는 그래프,6 is a graph showing a light emission chromaticity range of a light emitting device using a translucent fluorescent cover according to the present invention;
도 7은 본 발명에 의한 투광성 형광커버의 제 2 실시의 형태를 나타내는 단면도,7 is a cross-sectional view showing a second embodiment of a translucent fluorescent cover according to the present invention;
도 8은 본 발명에 의한 투광성 형광커버를 사용한 발광장치의 제 3 실시의 형태를 나타내는 단면도,8 is a cross-sectional view showing a third embodiment of a light emitting device using a translucent fluorescent cover according to the present invention;
도 9는 종래의 투광성 형광커버의 단면도,9 is a cross-sectional view of a conventional translucent fluorescent cover,
도 10은 종래의 투광성 형광커버를 사용하는 발광장치의 단면도,10 is a cross-sectional view of a light emitting device using a conventional translucent fluorescent cover;
도 1l은 YAG:Ce계 형광체의 여기스펙트럼을 나타내는 그래프,1L is a graph showing excitation spectra of YAG: Ce-based phosphors;
도 12는 YAG:Ce계 형광체의 발광 스펙트럼을 나타내는 그래프,12 is a graph showing an emission spectrum of a YAG: Ce-based phosphor;
도 13은 종래의 투광성 형광커버를 사용한 발광장치의 발광 스펙트럼을 나타내는 그래프,13 is a graph showing an emission spectrum of a light emitting device using a conventional transparent fluorescent cover;
도 14는 냉음극형광관의 발광스펙트럼의 일례를 나타내는 그래프,14 is a graph showing an example of emission spectra of a cold cathode fluorescent tube;
도 15는 투과형 칼라액정표시장치에 사용하는 칼라 필터의 투과스펙트럼의 일례를 나타내는 그래프,15 is a graph showing an example of transmission spectrum of a color filter used in a transmission color liquid crystal display device;
도 16은 종래의 투과성 형광커버를 사용하는 발광장치의 혼색의 원리를 나타내는 그래프,16 is a graph showing the principle of color mixing of a light emitting device using a conventional transparent fluorescent cover;
도 17은 종래의 투광성 형광커버를 사용한 발광장치의 발광가능한 색도범위를 나타내는 그래프이다.17 is a graph showing a range of light emission chromaticity of a light emitting device using a conventional translucent fluorescent cover.
<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>
1,2 : 배선도체 3 : 발광 반도체칩1,2: wiring conductor 3: light emitting semiconductor chip
4 : 리드세선 5 : 수지봉지체4: lead thin wire 5: resin encapsulation
5a : 원주부 5b : 구면부5a: circumferential portion 5b: spherical portion
6 : 형광커버 6a : 원통부6: fluorescent cover 6a: cylindrical part
6b : 구면부 7 : 형광체6b: spherical portion 7: phosphor
8 : 절연성 기판8: insulating substrate
예컨대 420 nm∼480 nm의 범위내에 있는 청색영역에 제 1 발광파장 피크를 갖는 제 1 발광파장 밴드의 빛을 발하는 발광다이오드를 피복하는 본 발명에 의한 발광다이오드용 투광성 형광커버는 제 1 발광파장 밴드의 빛에서 여기되는 형광체(7)를 함유한다. 형광체(7)는 여기시에, 제 1 발광파장 피크에서 분리한 녹색영역내의 제 2 발광파장 피크를 갖는 제 2 발광파장 밴드의 빛과, 제 2 발광파장비크로부터 분리한 적색영역내의 제 3 발광파장 피크를 갖는 제 3 발광파장 밴드의 빛을 발광한다. 따라서, 발광다이오드용 투광성 형광커버는 발광다이오드로부터 조사된 제 1 발광파장 밴드를 갖는 1종의 빛, 제 1 발광파장 밴드로부터 파장변환된 제 2 발광파장 밴드 및 제 3 발광파장 밴드의 2종의 빛의 합계 3종의 스펙트럼의 빛을 발광할 수가 있다. 형광체(7)는 망간에서 부활된 란터노이드·알루미네이트계 형광체를 포함하여, 망간의 함유량의 변화에 대하여 녹색발광영역과 적색발광영역을 갖는다. 망간을 다른 함유량으로 첨가한 란터노이드·알루미네이트계 형광체는 동일성분의 형광체이면서, 녹색발광과 적색발광을 생긴다. 형광체(7)는 화학식: LaAl11O18: Mn2+, La2O3·11Al2O3:Mn2+, La1-xAl11(2/3)+xO19:Mn2+ x(단, 0.1 ≤x≤0.99), (La, Ce)Al11O19:Mn2+, (La, Ce)Mg Al11O19:Mn2+의 적어도 하나로 나타낸다.For example, the transparent fluorescent cover for a light emitting diode according to the present invention, which covers a light emitting diode emitting light of a first light emitting wavelength band having a first light emitting wavelength peak in a blue region within a range of 420 nm to 480 nm, has a first light emitting wavelength band. Phosphor 7 that is excited by the light of? The phosphor 7 is excited at the time of excitation, the light of the second emission wavelength band having the second emission wavelength peak in the green region separated from the first emission wavelength peak, and the third in the red region separated from the second emission wavelength equipment. The light of the third emission wavelength band having the emission wavelength peak is emitted. Therefore, the transparent fluorescent cover for a light emitting diode has two kinds of light: one kind of light having a first emission wavelength band irradiated from the light emitting diode, a second emission wavelength band converted from a first emission wavelength band, and a third emission wavelength band. A total of three types of light can emit light. The phosphor 7 includes a lanthanoid aluminate-based phosphor revived from manganese, and has a green light emitting area and a red light emitting area with respect to the change in the content of manganese. The lanthanoid aluminate-based phosphors in which manganese is added in different contents are phosphors of the same component and produce green light emission and red light emission. Phosphor 7 is represented by the formula: LaAl 11 O 18 : Mn 2+ , La 2 O 3 .11Al 2 O 3 : Mn 2+ , La 1-x Al 11 (2/3) + x O 19 : Mn 2+ x However, at least one of 0.1 ≦ x ≦ 0.99, (La, Ce) Al 11 O 19 : Mn 2+ and (La, Ce) Mg Al 11 O 19 : Mn 2+ .
[발명의 실시의 형태][Embodiment of the Invention]
이하 본 발명에 의한 발광다이오드용 투광성 형광커버의 실시의 형태를 도 1∼도 6에 관해서 설명한다.Hereinafter, embodiments of the light-transmissive fluorescent cover for a light emitting diode according to the present invention will be described with reference to FIGS. 1 to 6.
본 발명에 의한 발광다이오드용 투광성 형광커버는 도 9 및 도 10에 나타내는 종래의 형광커버와 동일한 단면형상과 동일한 장착구조를 갖지만, 본 발명의 실시의 형태에서는, 발광 반도체칩(3)은 420 nm∼480 nm의 범위내에 있는 청색영역에 제 1 발광파장 피크를 갖는 제 1 발광파장 밴드(대역)의 빛을 발한다. 형광커버 (6)안에 담지되는 La알루미네이트:Mn계 형광체(7)는 제 1 발광파장 밴드의 빛으로 여기되고, 여기시에, 제 1 발광파장 피크에서 분리한 녹색영역내의 제 2 발광파장 피크를 갖는 제 2 발광파장 밴드의 빛과, 제 2 발광파장 피크로부터 분리한 적색영역내의 제 3 발광파장비크를 갖는 제 3 발광파장 밴드의 빛을 발광하기 때문에, 본 발명에 의한 발광다이오드용 투광성 형광커버는 합계 3종의 스펙트럼의 빛을 발광하고, 이들 단색광 및 합성색광을 생기게 할 수 있다. 형광체(7)는 예컨대, 화학식 LaAl11O18:M2+혹은 La2O3·11Al2O3:Mn2+로 나타내는 La알루미네이트:Mn계 형광체(7)인 Mn에서 부활된 란터노이드·알루미네이트계 형광체(7)의 하나이다.The light-emitting fluorescent cover for light emitting diode according to the present invention has the same mounting structure as that of the conventional fluorescent cover shown in FIGS. 9 and 10, but in the embodiment of the present invention, the light emitting semiconductor chip 3 is 420 nm. The first light emission wavelength band (band) having the first light emission wavelength peak is emitted in the blue region within the range of ˜480 nm. The La aluminate: Mn-based phosphor 7 carried in the fluorescent cover 6 is excited with light of the first emission wavelength band, and at this time, the second emission wavelength peak in the green region separated from the first emission wavelength peak. The light-emitting diode for light emitting diode according to the present invention emits light of the second light emitting wavelength band having the light emitting band and the light of the third light emitting wavelength band having the third light emitting wavelength band in the red region separated from the second light emitting wavelength peak. The fluorescent cover emits light of a total of three kinds of spectrums, and can generate these monochromatic light and synthetic color light. The phosphor 7 is, for example, a lanteroid revived from Mn, which is a La aluminate: Mn-based phosphor 7 represented by the formula LaAl 11 O 18 : M 2+ or La 2 O 3 .11Al 2 O 3 : Mn 2+ . One of the aluminate-based phosphors 7 is used.
본 발명을 사용한 발광장치의 제 1 특징은 삼파장냉음극형광관과 동일한 청색광, 녹색광, 적색광의, 서로 이격된 삼원색의 발광 스펙트럼을 가지는 점이다. 본 발명을 적용한 발광장치의 발광 스펙트럼은 도 1에 나타낸 바와 같이, 450 nm을 중심과 하는 청색발광 다이오드의 청색광과, La알루미네이트:Mn계 형광체(7)의 517 nm을 피크로 하는 녹색광과 690 nm을 피크로 하는 적색광의 서로 이격된 3가지의 발광파장 밴드로 구성된다. 따라서, 도 1에 나타내는 발광 스펙트럼은 도 13에 나타내는 종래의 발광장치의 발광 스펙트럼과 다르고, 도 14에 나타내는 냉음극형광관의 발광 스펙트럼과 유사의 스펙트럼을 가지며, 도 15에 나타내는 투과형 칼라액정표시장치의 칼라필터의 투과 스펙트럼과도 잘 일치한다.A first feature of the light emitting device using the present invention is that it has the same emission spectrum of three primary colors of blue light, green light and red light, which are the same as the three wavelength cold cathode fluorescent tube. As shown in Fig. 1, the emission spectrum of the light emitting device to which the present invention is applied is blue light of a blue light emitting diode having a center of 450 nm, and green light having a peak of 517 nm of La aluminate: Mn-based phosphor 7 as peaks. It consists of three light emission wavelength bands spaced apart from each other of red light having a peak of nm. Therefore, the emission spectrum shown in FIG. 1 is different from the emission spectrum of the conventional light emitting device shown in FIG. 13, has a spectrum similar to that of the cold cathode fluorescent tube shown in FIG. 14, and has a transmission color liquid crystal display device shown in FIG. It also matches well with the transmission spectrum of the color filter.
본 발명의 실시의 형태로서는, 형광체(7)는 구체적으로는, 망간에서 부활된 란터노이드·알루미네이트계 형광체이다. 형광체(7)는 바람직하게는 화학식: LaAl11O18: Mn2+또는 La2O3·11Al2O3:Mn2+로 표현되는 란턴(La)알루미네이트: Mn계 형광체 또는 La1-xAl11(2/3)+xO19:Mn2+ x(단, 0.1≤x≤0.99), (La, Ce)Al11O19:Mn2+, (La, Ce) MgAl11O19:Mn2+의 적어도 1개로 나타내는 형광체라도 좋다. 투광성 형광커버의 기재는 실리콘수지, 폴리에스테르수지, 아크릴수지, 엑폭시수지, 우레탄수지, 나일론수지, 폴리아미드수지, 폴리이미드수지, 염화비닐수지, 폴리카보네이트수지, 폴리에틸렌수지, 테프론수지, 폴리스틸렌수지, 폴리프로필렌수지, 폴리올레핀수지로부터 선택되는 1종 또는 2종 이상으로 이루어진다.As an embodiment of the present invention, the phosphor 7 is specifically a lanthanoid aluminate-based phosphor revived in manganese. The phosphor 7 is preferably a Lanton (La) aluminate represented by the formula: LaAl 11 O 18 : Mn 2+ or La 2 O 3 · 11Al 2 O 3 : Mn 2+ : Mn-based phosphor or La 1-x Al 11 (2/3) + x O 19 : Mn 2+ x (0.1 ≦ x ≦ 0.99), (La, Ce) Al 11 O 19 : Mn 2+ , (La, Ce) MgAl 11 O 19 : The phosphor represented by at least one of Mn 2+ may be used. The base material of the transparent fluorescent cover is silicone resin, polyester resin, acrylic resin, epoxy resin, urethane resin, nylon resin, polyamide resin, polyimide resin, vinyl chloride resin, polycarbonate resin, polyethylene resin, teflon resin, polystyrene resin It consists of 1 type (s) or 2 or more types chosen from polypropylene resin and polyolefin resin.
본 발명에 의한 투광성의 형광커버(6)는 예컨대, 기재에 La알루미네이트:Mn계 형광체의 분말을 혼합하여 트랜스퍼몰드 또는 폿팅 등의 수지성형법에 의해서 형성되고, 발광다이오드의 수지봉지체(5)에 피착된다. 실리콘수지, 염화 비닐수지, 폴리이미드수지 등의 연질성의 수지를 기재로 선택하면, 형광커버(6)에 어느 정도의 탄력성을 부여할 수 있고, 발광다이오드의 수지봉지체에 형광커버를 탄력성에 의해 용이하게 장착할 수 있음과 동시에, 밀착성이 높아져 형광커버(6)의 자립유지가 가능해진다. 다른 방법으로서, 광투과성의 접착제로 수지봉지체(5)에 형광커버(6)를 접착하거나, 열수축성의 기재에 의해 투광성 형광커버(6)를 형성하여, 수지봉지체(5)에 씌운 뒤에 가열하여 열수축작용에 의해 밀착시키더라도 좋다. 또 한편, 발광다이오드의 수지봉지체(5)에 분무 또는 디핑 등의 방법에 의해, 본 발명의 형광커버(6)를 직접 형성하는 상태로 피착시키더라도 좋다. 본 발명의 투광성 형광커버(6)는 전체둘레에 걸쳐 균일한 두께 또는 부분적으로 두께가 달라도 좋다.The translucent fluorescent cover 6 according to the present invention is formed by a resin molding method such as transfer mold or potting by mixing a powder of La aluminate: Mn-based phosphor on a substrate, for example, and a resin encapsulation member 5 of a light emitting diode. Is deposited. When a flexible resin such as silicone resin, vinyl chloride resin, polyimide resin, or the like is selected as the base material, it is possible to impart some elasticity to the fluorescent cover 6, and the fluorescent cover is elastically applied to the resin encapsulation member of the light emitting diode. It can be attached easily, and adhesiveness becomes high, and self-supporting maintenance of the fluorescent cover 6 is attained. Alternatively, the fluorescent cover 6 is adhered to the resin encapsulation 5 with a light-transmissive adhesive, or the transparent fluorescent cover 6 is formed by a heat-shrinkable base material, and then covered with the resin encapsulation 5 and heated. It may be in close contact by the heat shrink action. Alternatively, the fluorescent encapsulation 6 of the present invention may be deposited directly onto the resin encapsulation member 5 of the light emitting diode by a method such as spraying or dipping. The translucent fluorescent cover 6 of the present invention may have a uniform thickness or a partial thickness throughout its entire circumference.
발광다이오드를 제조할 때에, 기판상에 형성된 반도체층을 가지는 발광 반도체칩(3)을 접착제로 배선도체(1)의 오목부(1a)의 바닥면에 접착고정한다. 발광 반도체칩(3)은 예컨대, 에피텍샬성장 등의 단결정성장법에 의해서 SiC 등의 반도체기판 또는 사파이어 등의 세라믹기판상에 형성된 GaN, InGaN, InGaAlN 등의 질화갈륨계 화합물반도체층을 가지며, 발광파장 피크파장이 420 nm∼480 nm의 청색발광다이오드 칩이다. 그 다음, 와이어본딩에 의하여 리드세선(4)을 발광 반도체칩(3)의 전극과 제 2 배선도체(2)의 정점부에 전기적으로 접속한 후에, 광투과성을 갖는 엑폭시수지 등의 유기수지로 포탄형 형상 등에 몰드(수지봉지체)하여 형성된다.When manufacturing a light emitting diode, the light emitting semiconductor chip 3 which has a semiconductor layer formed on the board | substrate is adhesively fixed to the bottom surface of the recessed part 1a of the wiring conductor 1 with an adhesive agent. The light emitting semiconductor chip 3 has a gallium nitride compound semiconductor layer, such as GaN, InGaN, InGaAlN, formed on a semiconductor substrate such as SiC or a ceramic substrate such as sapphire by a single crystal growth method such as epitaxial growth. The wavelength peak wavelength is a blue light emitting diode chip of 420 nm to 480 nm. Then, after the lead thin wire 4 is electrically connected to the electrode of the light emitting semiconductor chip 3 and the apex of the second wiring conductor 2 by wire bonding, an organic resin such as an epoxy resin having light transparency It is formed by mold (resin encapsulation) in a shell shape or the like.
Mn2+과 Eu2+의 공부활에 의해 자외선으로 여기되는 공지의 La2O3· 11Al2O3:Mn2+, Eu2+형광체는 자외광에 의해서 여기된 Eu2+에서 에너지를 받아들인 Mn2+가 발광하는 발광원리를 갖지만, 본 발명자는 Eu를 포함하지 않은 La2O3· 11Al2O3:Mn2+형광체가 청색광으로 효율적으로 여기되고, 또한, Mn의 첨가량을 조정함에 의해, 서로 이격되는 발광파장영역에 있는 녹색과 적색의 다른 2개의 발광파장 밴드를 갖는 것에 착안하였다.Known to be excited by ultraviolet rays by the ball revival of Mn 2+ and Eu 2+ La 2 O 3 · 11Al 2 O 3: Mn 2+, Eu 2+ phosphor by the UV light energy received from the Eu 2+ where Although the present Mn 2+ has a light emission principle of emitting light, the present inventors have found that La 2 O 3 · 11Al 2 O 3 : Mn 2+ phosphor which does not contain Eu is efficiently excited by blue light, and the amount of Mn added is adjusted. The present invention focuses on having two different light emission wavelength bands of green and red in the light emission wavelength regions spaced apart from each other.
La알루미네이트:Mn계 형광체의 부활재로서 쓰이는 2가의 망간·이온(Mn2+)은 그 발광파장이 모재의 결정장의 크기에 민감하기 때문에, 모재중에 다른 Mn2+위치가 있으면 복수의 발광파장 밴드가 생기는 특징을 가진다. La알루미네이트는 스피넬구조를 가지는 모재이지만, 그 속에서 Mn2+는 4배위와 6배위를 차지하고, 각각 517 nm을 피크로 하는 녹색발광과, 690 nm을 피크로 하는 적색발광을 발생시킨다. 또한, 450 nm을 중심으로 하는 청색영역에서 효율적으로 여기된다. 도 2에 La알루미네이트: Mn계 형광체의 여기 스펙트럼을, 또한 도 3에 La알루미네이트:Mn계 형광체의 발광 스펙트럼을 나타낸다.La aluminate: divalent manganese ions (Mn 2+ ) used as activators of Mn-based phosphors are sensitive to the size of the crystal field of the base material, so that if there are different Mn 2+ positions in the base material, a plurality of light emission wavelengths It is characterized by the appearance of a band. La aluminate is a base material having a spinel structure, in which Mn 2+ occupies four coordination and six coordination, and generates green light emission with peak at 517 nm and red light emission with peak at 690 nm, respectively. In addition, it is efficiently excited in the blue region around 450 nm. The excitation spectrum of La aluminate: Mn type phosphor is shown in FIG. 2, and the emission spectrum of La aluminate: Mn type phosphor is shown in FIG.
La알루미네이트:Mn계 형광체의 녹색발광과 적색발광의 비율은 Mn의 첨가량에 따라 정해진다. 도 4에 La알루미네이트:Mn계 형광체의 Mn 첨가량(중량 또는 용량의 비율)으로 발광색의 관계를 나타낸다. Mn의 첨가량이 0.4보다 적은 경우는 녹색발광만이 나타나지만, 첨가량을 증가하면, 적색발광이 나타나며, 또한 첨가량을 0.8이상으로 늘리면 적색발광에만 변하고, 0.4∼0.8은 과도영역이다. 따라서 La알루미네이트:Mn계 형광체는 Mn의 첨가량을 조정함으로써 녹색에서 적색에 이르는 넓은 발광파장범위에서 선택적으로 발광색을 조정할 수가 있다.The ratio of green light emission to red light emission of La aluminate: Mn-based phosphor is determined according to the amount of Mn added. Fig. 4 shows the relationship of the emission color by the amount of Mn added (a ratio of weight or capacity) of the La aluminate: Mn-based phosphor. When the amount of Mn added is less than 0.4, only green light emission appears, but when the amount added increases, red light emission appears, and when the amount added exceeds 0.8, only the red light emission changes, and 0.4 to 0.8 are transient regions. Accordingly, the La aluminate: Mn-based phosphor can selectively adjust the emission color in a wide emission wavelength range from green to red by adjusting the amount of Mn added.
따라서, 청색발광다이오드와 La알루미네이트:Mn계 형광체를 조합시키면, 청색발광 다이오드의 청색광의 일부에 의해 La알루미네이트:Mn계 형광체가 여기되어 녹색광과 적색광을 발생시키기 때문에, 본 발명의 투과성 형광커버에서는, 간편한 수단에 의해 파장변환되지 않는 청색발광다이오드의 나머지의 청색광의 혼색광, 즉 서로 파장영역이 이격되는 청색광, 녹색광 및 적색광의 삼원색의 빛을 발하는 발광장치를 실현할 수가 있다.Therefore, the combination of the blue light emitting diode and the La aluminate: Mn-based phosphor causes the La aluminate: Mn-based phosphor to be excited by a part of the blue light of the blue light emitting diode to generate green light and red light. In this embodiment, it is possible to realize a light emitting device that emits mixed light of the remaining blue light of the blue light emitting diode that is not converted into wavelengths by simple means, that is, light of three primary colors of blue light, green light, and red light spaced apart from each other.
La알루미네이트:Mn계 형광체는 본 발명에 사용할 수 있는 형광체의 일례이며, 본 발명에 사용되는 형광체의 모재는 이에 한정되지 않는다. 본 발명에 사용되는 형광체 모재의 총칭인 란터노이드·알루미네이트는 란터노이드원소의 알루민산염, 즉, 란터노이드원소와 알미늄의 산화화합물이다.La aluminate: Mn-based phosphor is an example of the phosphor that can be used in the present invention, the base material of the phosphor used in the present invention is not limited thereto. Lanternoid aluminate, which is a generic term for the phosphor base material used in the present invention, is an aluminate of a lanthanoid element, that is, an oxidized compound of the lanthanoid element and aluminum.
희토류원소로서 알려져 있는 란터노이드원소에는, La(란턴), Ce(세륨), Pr(프라세오디뮴), Nd(네오딤), Pm(프로메튬), Sm(사마륨), Eu(유로피움), Gd(가드리늄), Tb(텔비움), Dy(디스프로슘), Ho(홀뮴), Er(엘븀), Tm (트리움), Yb(잇텔븀), Lu(루테티움)가 포함된다.Lanternoid elements known as rare earth elements include La (lantern), Ce (cerium), Pr (praseodymium), Nd (neodymium), Pm (promethium), Sm (samarium), Eu (Europeium), and Gd (guard). Linium), Tb (telvium), Dy (dysprosium), Ho (holmium), Er (elbium), Tm (trium), Yb (ytterbium), Lu (luteteium).
La에 한정되지 않고 상기 원소단체의 알루민산염 또는 복수의 원소 알루민산염을 본 발명의 형광체 모재에 쓰면, 형광체의 여기파장 및 녹색, 적색의 발광파장을 여러 가지로 조정할 수가 있고, 본 발명을 적용하는 발광장치의 표색범위 등을 다양하게 바꿀 수 있다. 또한, 본 발명의 형광체의 온도특성 및 발광효율을 개선하기 위해서, Mn 이외의 부활재를 첨가하는 것도 가능하다.When the aluminate or plural elemental aluminates of elemental elements are not limited to La and used in the phosphor matrix of the present invention, the excitation wavelength of the phosphor and the emission wavelength of green and red can be adjusted in various ways. The color range of the light emitting device to be applied can be variously changed. Moreover, in order to improve the temperature characteristic and luminous efficiency of the fluorescent substance of this invention, it is also possible to add activators other than Mn.
본 발명에 의한 투광성 형광커버에 쓰이는 La알루미네이트:Mn계 형광체는 도 4에 나타낸 바와 같이, Mn 농도를 조정함으로써 녹색광과 적색광의 성분비를 자유롭게 조정할 수가 있다. 또한, 본 발명을 적용하는 발광장치는 형광체(7)의 농도를 조정함으로써 청색발광다이오드의 청색광과 형광체(7)의 녹색광·적색광의 밸런스를 자유롭게 조정할 수 있으므로, 본 발명을 적용하는 발광장치로부터 백색계의 빛에 합성하여 외부에 혼색광을 방출할 수가 있다. 따라서, 투과형 칼라액정표시장치의 백라이트 등에도 본 발명을 사용한 발광장치를 적합하게 사용할 수가 있다. 도 5는 본 발명을 적용한 발광장치의 혼색의 원리를 나타낸다.As shown in Fig. 4, the La aluminate: Mn-based fluorescent material used in the translucent fluorescent cover according to the present invention can freely adjust the component ratio of green light and red light. In addition, the light emitting device to which the present invention is applied can freely adjust the balance between the blue light of the blue light emitting diode and the green light and the red light of the phosphor 7 by adjusting the concentration of the phosphor 7, and therefore the white light is applied from the light emitting device to which the present invention is applied. It can be combined with the light of the system and emit mixed light to the outside. Therefore, the light emitting device using the present invention can be suitably used also for a backlight of a transmissive color liquid crystal display device. 5 shows the principle of color mixing in a light emitting device to which the present invention is applied.
본 발명을 사용한 발광장치의 제 2 특징은 형광체(7)의 배합비를 조정하면, 외부광과 동일한 표시화상의 색조밸런스를 얻을 수 있다는 점이다. 본 발명에 의한 투광성 형광커버에 사용되는 La알루미네이트:Mn계 형광체(7)의 발광 스펙트럼은 도 12에 나타내는 종래의 투광성 형광커버에 사용되는 YAG:Ce계 형광체(7)의 발광 스펙트럼과 달리, 도 3에 나타낸 바와 같이 심적색영역에도 넓어진 스펙트럼을 갖는다. 또한, 도 4에 나타낸 바와 같이, La알루미네이트:Mn계 형광체(7)는 Mn 농도를 조정하여 녹색광과 적색광의 성분비를 자유롭게 조정할 수 있기 때문에, 본 발명을 적용한 발광장치에는, 태양광 등의 외부광원과 동일한 색조 밸런스를 부여할수가 있다. 따라서, 본 발명을 사용한 발광장치는 반사형 칼라액정표시장치의 보조광원에도 적합하게 사용할 수가 있다.A second feature of the light emitting device using the present invention is that, when the compounding ratio of the phosphor 7 is adjusted, the color tone balance of the same display image as that of the external light can be obtained. The emission spectrum of the La aluminate: Mn-based phosphor 7 used in the light-transmissive fluorescent cover according to the present invention is different from the emission spectrum of the YAG: Ce-based phosphor 7 used in the conventional light-transmissive fluorescent cover shown in FIG. As shown in Fig. 3, the deep red region has a broad spectrum. In addition, as shown in Fig. 4, since the La aluminate: Mn-based phosphor 7 can freely adjust the component ratio of green light and red light by adjusting Mn concentration, the light emitting device to which the present invention is applied has no external light such as solar light. The same color balance as the light source can be given. Therefore, the light emitting device using the present invention can be suitably used also for the auxiliary light source of the reflective color liquid crystal display device.
본 발명을 적용한 발광장치의 제 3 특징은 장시간 눈을 사용하는 작업에 있어서도 눈이 피로하지 않은 점이다. 도 13에 나타내는 종래의 발광장치의 발광 스펙트럼과 다르고, 본 발명을 사용한 발광장치의 발광스펙트럼은 도 1에 나타낸 바와 같이 청색광, 녹색광, 적색광에 의해서 구성된다. 이들 빛은 서로 보색의 관계에 있지 않으며, 장시간 눈을 사용하는 작업에 본 발명에 의한 발광장치를 사용하더라도 눈이 지치지 않는다. 따라서 본 발명을 적용한 발광장치는 일반 조명광원으로서도 적합하게 사용할 수가 있다.A third feature of the light-emitting device to which the present invention is applied is that the eye is not tired even when using the eye for a long time. Different from the emission spectrum of the conventional light emitting device shown in FIG. 13, the light emission spectrum of the light emitting device using the present invention is composed of blue light, green light, and red light as shown in FIG. These lights do not have a complementary color relationship with each other, and the eyes are not tired even when the light emitting device according to the present invention is used for work using the eyes for a long time. Therefore, the light emitting device to which the present invention is applied can be suitably used also as a general illumination light source.
본 발명을 사용한 발광장치의 제 4 특징은 여러가지 색조의 빛을 창조할 수 있는 점이다. 본 발명을 적용하여 발광장치에서는, 방출되는 빛이 청색광, 녹색광, 적색광에 의해서 구성되며, 이들 혼색광은 색도도상에서 대단히 폭넓은 영역을 차지한다. 도 6에 나타내는 본 발명을 적용한 발광장치는 도 17에 나타내는 종래의 발광장치의 발광가능한 색도범위와 비교하여, 색도범위가 대단히 폭넓은 것을 알 수 있다. 따라서 본 발명을 사용한 발광장치는 다양한 색조가 풍부한 색채표현이 필요한 용도에도 적합하게 사용할 수가 있다.A fourth feature of the light emitting device using the present invention is that light of various color tones can be created. In the light-emitting device to which the present invention is applied, the emitted light is composed of blue light, green light, and red light, and these mixed light occupies a very wide area on the chromaticity diagram. It can be seen that the light emitting device to which the present invention shown in FIG. 6 is applied has an extremely wide chromaticity range compared with the light emitting color range of the conventional light emitting device shown in FIG. 17. Therefore, the light emitting device using the present invention can be suitably used even in applications requiring a rich color expression.
일반적으로, 발광다이오드는 방출하는 빛의 지향특성을 가지며, 지향각 방향에 의해서 광강도가 다르므로, 전체둘레에 걸쳐 두께가 균일의 투광성 형광커버를 씌우면, 광강도가 강한 방향과 약한 방향에서는, 발광색이 다른 문제점이 생길 경우가 있다. 이것을 방지하기 위해서는, 발광강도가 강한 부분의 두께를 두텁게,약한 부분의 두께를 얇게 하여 발광다이오드의 발광강도분포에 따라 투광성 형광커버의 두께를 변화시키면, 전체둘레에 걸쳐 균일한 발광색이 된다. 도 7은 투광성 형광커버를 개량한 본 발명에 의한 투광성 형광커버의 제 2 실시의 형태를 나타낸다. 포탄형 형상의 수지봉지체(5)를 갖는 발광다이오드는 수지봉지체(5)의 렌즈형상을 이루는 구면부(5b)에서는 첨단부분의 광강도가 가장 강하고, 측면방향을 따라서 서서히 광강도가 저하하는 지향특성을 가진다. 본 실시의 형태는, 포탄형 형상의 발광다이오드의 지향특성에 적합시켜, 수지봉지체(5)의 첨단부분에 해당하는 형광커버(6)의 구면부(6b)의 두께를 두껍게 하고 측면방향을 따라서 서서히 얇게 하여, 전체둘레에 걸쳐 균일한 발광색을 얻을 수 있다.In general, the light emitting diodes have a directing characteristic of light emitted and have different light intensities depending on the direction of the directivity angle. Therefore, when the transparent fluorescent cover with uniform thickness is applied over the entire circumference, in the strong and weak directions, There are cases where different emission colors occur. In order to prevent this, if the thickness of the portion where the light emission intensity is strong and the thickness of the weak portion is reduced and the thickness of the translucent fluorescent cover is changed in accordance with the light emission intensity distribution of the light emitting diode, the light emission color becomes uniform throughout the entire circumference. Fig. 7 shows a second embodiment of the light-transmissive fluorescent cover according to the present invention in which the light-transmissive fluorescent cover is improved. The light emitting diode having the shell-shaped resin encapsulation 5 has the strongest light intensity at the tip portion in the spherical portion 5b forming the lens shape of the resin encapsulation 5, and gradually decreases the light intensity along the lateral direction. Has a directing characteristic. According to the present embodiment, the spherical portion 6b of the fluorescent cover 6 corresponding to the tip portion of the resin encapsulation body 5 is made thick so as to conform to the directivity characteristic of the shell-shaped light emitting diode. Therefore, it becomes thin gradually and can obtain uniform luminescent color over the whole circumference.
도 8은 칩 LED라고 불리는 표면설치용의 초소형의 발광다이오드에 본 발명의 투광성 형광커버를 적용한 발광장치의 제 3 실시의 형태를 나타낸다. 도 3에 나타내는 발광다이오드는 절연성기판(8)의 한쪽 주요면(8a)에서 다른쪽의 주요면(8b)으로 연장하는 한 쌍의 배선도체(1,2)와, 배선도체(1)의 끝단부에 접착제로 접착된 청색발광다이오드 칩인 발광 반도체칩(3)과, 발광 반도체칩(3)의 전극과 배선도체 (1,2)를 전기적으로 접속하는 리드세선(4a,4b)과, 절연성기판(8)의 한쪽 주요면 (8b)측에 사출성형 등에 의해 형성된 엑폭시수지 등의 수지봉지체(5)를 구비하고 있다. 본 실시형태에서는, 수지봉지체(5)의 경사하는 측면으로의 자기유지가 곤란하므로, 투광성 형광커버(6)는 광투과성의 접착제를 사용하여, 수지봉지체(5)에 접착된다. 다른 방법으로서, 분무 또는 디핑 등에 의해, 수지봉지체(5)에 직접 형성하여도 좋다.Fig. 8 shows a third embodiment of a light emitting device in which the light-emitting fluorescent cover of the present invention is applied to an ultra-small light emitting diode for surface installation called a chip LED. The light emitting diode shown in FIG. 3 has a pair of wiring conductors 1 and 2 extending from one main surface 8a of the insulating substrate 8 to the other main surface 8b and the ends of the wiring conductor 1. A light emitting semiconductor chip 3, which is a blue light emitting diode chip bonded to an adhesive part, lead wires 4a and 4b for electrically connecting the electrodes of the light emitting semiconductor chip 3 to the wiring conductors 1 and 2, and an insulating substrate On one main surface 8b side of (8), a resin encapsulation member 5 such as an epoxy resin formed by injection molding or the like is provided. In this embodiment, since the self-maintenance to the inclined side surface of the resin encapsulation body 5 is difficult, the translucent fluorescent cover 6 is adhere | attached to the resin encapsulation body 5 using a light transmissive adhesive agent. As another method, it may form directly on the resin encapsulation body 5 by spraying or dipping.
또, 본 발명에 의한 투광성 형광커버(6)를 사용한 발광장치의 실시의 형태에서는, 편의상, 도 10의 구조로서는 도전성의 SiC 기판상에 질화갈륨계 발광층을 설치한 발광다이오드 칩을 사용하고, 도 8의 구조에서는 절연성의 사파이어 기판상에 질화갈륨계 발광층을 설치한 발광다이오드 칩을 사용하지만, 본 발명은 상기 재료 및 구조에 제한되지 않고, 소정의 발광파장범위내이면, 어떠한 구조의 발광다이오드 칩이라도 본 발명을 사용한 발광장치에 사용할 수 있다.In the embodiment of the light emitting device using the translucent fluorescent cover 6 according to the present invention, for convenience, the light emitting diode chip in which a gallium nitride-based light emitting layer is provided on a conductive SiC substrate is used as the structure of FIG. In the structure of 8, a light emitting diode chip in which a gallium nitride-based light emitting layer is provided on an insulating sapphire substrate is used. However, the present invention is not limited to the above materials and structures. Even the light emitting device using the present invention can be used.
이상 서술한 바와 같이, 본 발명에 의한 발광장치는 청색발광다이오드와 YAG:Ce계 형광체(7)를 사용한 종래의 발광장치가 가지는 많은 문제를 극복할 수 있는 우수한 특성을 가진다. 또한, 본 발명에 의한 반도체발광장치중, 특히 백색계의 빛을 발하는 반도체발광장치는, 구래의 관구식 백색광원인 백열전구나 열음극형광관, 냉음극형광관 등에 비하여, 기계적 강도가 높고, 발열량이 적고, 고전압이 불필요하고, 고주파 노이즈를 발생하지 않고, 수은을 사용하지 않고 환경에 온화하다는 점등이 우수한 이점을 병유하기 때문에, 본격적인 차세대 고체화백색광원으로서 대단히 기대할 수 있다.As described above, the light emitting device according to the present invention has excellent characteristics that can overcome many problems of the conventional light emitting device using the blue light emitting diode and the YAG: Ce-based phosphor 7. The semiconductor light emitting device of the present invention, in particular, emits white light, has a higher mechanical strength and a lower heat generation rate than incandescent lamps, hot cathode fluorescent tubes, cold cathode fluorescent tubes, etc., which are conventional white light sources. Since the high voltage is unnecessary, high frequency noise is not generated, and mercury is used, the lighting is gentle to the environment, and thus, excellent advantages can be expected.
본 발명에 의한 투광성 형광커버를 사용한 발광장치에서는, 청색발광다이오드의 청색광과 형광체의 녹색광·적색광의 밸런스를 자유롭게 조정할 수 있고, 외부광과 동일한 표시화상의 색조밸런스를 얻을 수 있으며, 반사형 칼라액정표시장치의 보조광원으로서도 적합하게 사용할 수가 있다. 백색계의 빛에 합성하여 외부에 혼색광을 방출할 수 있기 때문에, 투과형 칼라액정표시장치의 백라이트 등에도 적합하게 사용할 수가 있다. 또한, 서로 보색의 관계에 있지 않은 청색광, 녹색광, 적색광의 삼원색의 혼색에 의해서 외부에 방출하는 빛을 넓은 색도범위의 색조로 합성할 수가 있고, 풍부한 색채표현을 필요로 하는 용도에도 적합하게 사용할 수가 있어, 장시간 눈을 사용하는 작업에 있어서도 눈이 지치지 않고, 일반 조명광원으로서 적합하게 사용할 수가 있다. 또한, 염가로 품질이 뛰어난 발광다이오드용 투광성 형광커버를 얻을 수 있다.In the light emitting device using the translucent fluorescent cover according to the present invention, the balance between the blue light of the blue light emitting diode and the green light and the red light of the phosphor can be freely adjusted, and the color balance of the display image that is the same as the external light can be obtained. It can be used suitably as an auxiliary light source of a display apparatus. Since it can be combined with white light and emit mixed color light to the outside, it can be suitably used for backlight of transmissive color liquid crystal display device. In addition, by combining the three primary colors of blue light, green light, and red light that are not complementary to each other, the light emitted to the outside can be synthesized into a wide range of chromatic tones, and can be suitably used for applications requiring rich color expression. Therefore, even when the eye is used for a long time, the eye is not tired and can be suitably used as a general illumination light source. In addition, it is possible to obtain a transparent fluorescent cover for a light emitting diode having excellent quality at low cost.
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| JP2000391457A JP2002190622A (en) | 2000-12-22 | 2000-12-22 | Transmissive fluorescent cover for light emitting diode |
| JPJP-P-2000-00391457 | 2000-12-22 |
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| JP2907286B1 (en) * | 1998-06-26 | 1999-06-21 | サンケン電気株式会社 | Resin-sealed semiconductor light emitting device having fluorescent cover |
| US5959316A (en) * | 1998-09-01 | 1999-09-28 | Hewlett-Packard Company | Multiple encapsulation of phosphor-LED devices |
| JP3424566B2 (en) * | 1998-09-29 | 2003-07-07 | 松下電器産業株式会社 | Fluorescent lamps and lighting equipment |
| US6656608B1 (en) * | 1998-12-25 | 2003-12-02 | Konica Corporation | Electroluminescent material, electroluminescent element and color conversion filter |
| JP2000208822A (en) * | 1999-01-11 | 2000-07-28 | Matsushita Electronics Industry Corp | Semiconductor light-emitting device |
| KR200181326Y1 (en) * | 1999-12-24 | 2000-05-15 | 서울반도체주식회사 | Chroma-converted light-emitting diode |
| KR100372834B1 (en) * | 2000-05-25 | 2003-02-19 | 에이프로시스템즈 (주) | Light emitting semiconductor device for emitting lights having complex wavelengths through fluorescent material thereof |
| JP3609709B2 (en) * | 2000-09-29 | 2005-01-12 | 株式会社シチズン電子 | Light emitting diode |
| JP2002118292A (en) | 2000-10-11 | 2002-04-19 | Sanken Electric Co Ltd | Semiconductor light-emitting device |
-
2000
- 2000-12-22 JP JP2000391457A patent/JP2002190622A/en active Pending
-
2001
- 2001-12-20 KR KR1020010081578A patent/KR100587126B1/en not_active IP Right Cessation
- 2001-12-20 EP EP01130432A patent/EP1220332A3/en not_active Withdrawn
- 2001-12-21 US US10/026,871 patent/US7906904B2/en not_active Expired - Fee Related
- 2001-12-21 TW TW090131893A patent/TW535304B/en not_active IP Right Cessation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100556555B1 (en) * | 2001-11-14 | 2006-03-06 | 가부시키가이샤 시티즌 덴시 | Light emitting diode device |
| WO2015053932A1 (en) * | 2013-10-11 | 2015-04-16 | Performance Indicator, Llc | Smoothing phosphors for ac led lighting |
| US9683169B2 (en) | 2013-10-11 | 2017-06-20 | Performance Indicator, Llc | Smoothing phosphors for AC LED lighting |
| KR102035972B1 (en) * | 2019-04-29 | 2019-10-29 | 셀바이오코리아 주식회사 | Mask pack having a phototherapy function |
Also Published As
| Publication number | Publication date |
|---|---|
| TW535304B (en) | 2003-06-01 |
| EP1220332A3 (en) | 2005-10-12 |
| KR100587126B1 (en) | 2006-06-07 |
| EP1220332A2 (en) | 2002-07-03 |
| US7906904B2 (en) | 2011-03-15 |
| JP2002190622A (en) | 2002-07-05 |
| US20020080501A1 (en) | 2002-06-27 |
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